US3916757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fasteners
Assignee: Illinois Tool Works Inc
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Filing: 1974-10-23
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Granted: 1975-11-04
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Expires: 1994-10-23
Abstract
Abstract A fastener, preferably a screw fastener, having a shank, a head at one end of said shank, an entry portion at the end of said shank opposite said head and being capable of forming a hole in a workpiece, and at least one cutter means on said shank between said head and said entry portion; said at least one cutter means being capable of forming a countersunk recess about said hole.
Inventors
- 👤 Robert Neil Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:35
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/001; F16B25/0031; F16B25/0036; F16B25/0089; F16B25/10; F16B25/103; F16B35/00; F16B35/04; F16B35/041; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/905; Y10T408/906
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A fastener having a shank, a head at one end of said shank and an entry portion at the other end of said shank, a threaded portion intermediate the entry portion and the head, the undersurface of the head being generally frustoconical tapering upwardly and outwardly from the shank at a predetermined angle to the longitudinal axis of the fastener, at least one wing-like cutting member frangibly connected to the shank including a leading edge and trailing edge, the leading edge being disposed at an angle to the longitudinal axis substantially equal to the predetermined angle of the head undersurface, the radial extent of the leading edge of the cutting member being substantially equal to the radial extent of the tapered undersurface of the head, wherein the cutting member is capable of forming a countersunk recess in a workpiece complementary to the head configuration.
Claim 2
Dependent Claim
144 words
A fastener having a shank, a head at one end of said shank and an entry portion at the other end of said shank, a threaded portion intermediate the entry portion and the head, the undersurface of the head being generally frustoconical tapering upwardly and outwardly from the shank at a predetermined angle to the longitudinal axis of the fastener, at least one wing-like cutting member frangibly connected to the shank including a leading edge and trailing edge, the leading edge being disposed at an angle to the longitudinal axis substantially equal to the predetermined angle of the head undersurface, the radial extent of the leading edge of the cutting member being substantially equal to the radial extent of the tapered undersurface of the head, wherein the cutting member is capable of forming a countersunk recess in a workpiece complementary to the head configuration.
Claim 3
Dependent Claim
20 words
A fastener in accordance with claim 1, wherein two diametrically opposed, substantially identical cutting members are formed on the shank.
Claim 4
Dependent Claim
55 words
A fastener in accordance with claim 1, wherein the trailing edge of the cutting member extends substantially at right angles to the longitudinal axis of the fastener and the cutting member further includes an outer edge interconnecting the radial outermost extremity of the trailing and leading edges and extends generally parallel to the longitudinal axis.
Claim 5
Dependent Claim
15 words
A fastener in accordance with claim 1, wherein the entry portion includes a self-drilling point.
Claim 6
Dependent Claim
21 words
A fastener in accordance with claim 1, wherein the cutting member is located intermediate the entry portion and the threaded portion.
Claim 7
Dependent Claim
20 words
A fastener in accordance with claim 1, wherein the cutting member is located intermediate the threaded portion and the head.
References Cited (Backward Citations)
US3358548A
Cited
US3699841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |